Fix searching for frame_arms (#1061)

Just mapping '_' to ' ' for both search and indexing

deploy/ansible/roles/elasticsearch/files/elasticsearch_settings.yml

@@ -10,6 +10,7 @@ settings:
           - standard
           - lowercase
         char_filter:
+          - underscore_to_space
           - dash_to_underscore
 
       nyaapantsu_index_analyzer:
@@ -19,6 +20,7 @@ settings:
           - lowercase
           - e_ngram_filter
         char_filter:
+          - underscore_to_space
           - dash_to_underscore
 
     filter:
@@ -33,6 +35,11 @@ settings:
         pattern: "([^\\s]+)-(?=[^\\s]+)"
         replacement: "$1_"
 
+      underscore_to_space:
+        type: mapping
+        mappings:
+          - "_ => \\u0020"
+
   index:
     number_of_shards: 1
     number_of_replicas: 0